We study the correlation between the spin configuration and the average number of conduction electrons, based on the Kondo lattice type Hamiltonian. We found that a change in the average number of conduction electrons causes a change in the spin configuration. This results from the competition among the strong Coulomb repulsion, Hund's coupling, and antiferromagnetic interaction. A change in spin configuration from an antiferromagnetic ordering to a spin spiral state can be initiated by slightly doping holes into the half-filled state. We also found that the spin spiral state exhibits a correspondingly larger conductance than the antiferromagnetic state. On the basis of these results, we suggest that it is possible to alter the conductance (transport property) of transition metal oxides by inducing a change in the spin configuration through the application of an external voltage.
The gauge interaction and mass generation through the Higgs mechanism is worked out for a Grassmannian SU(5) model, which among many other states, predicts three light neutrinos and two heavy ones. It is found that Simpson’s 17 keV neutrino remains incompatible with the MSW solution to the solar neutrino puzzle in this framework
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.